// Copyright 2017 The Closure Rules Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package io.bazel.rules.closure.worker;

import java.io.InputStream;
import java.io.PrintStream;
import org.junit.rules.ExternalResource;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** JUnit rule that restores standard i/o after each test case. */
@RunWith(JUnit4.class)
public final class StdioRestoreRule extends ExternalResource {

  private final InputStream realStdIn = System.in;
  private final PrintStream realStdOut = System.out;
  private final PrintStream realStdErr = System.err;

  @Override
  protected void after() {
    System.setIn(realStdIn);
    System.setOut(realStdOut);
    System.setErr(realStdErr);
    super.after();
  }
}
